are all 700R4s overdrive

[Ditchdigger]

I have an 84 K-5 with a 305ci Q-jet
and wandering if all 700R4s have OD
and I am also wandering what rear end gears I
have, it has 10 bolt diffs front and rear

If it ain't intimidating / It ain't a Chevy!

 

[BlazerGuy]

Yes all 700's are overdrive. Look inside your glove compartment and look at the codes in there, it should tell what gears you have but I dont know what the individual codes mean(I'm sure someone else does), there also may be a sticker on the inner fender that tells you. Or you could pull the cover and use this formula:
Ring Gear Teeth Count / Pinion Gear Teeth = Gear Ratio


Murphy's Laws on Life :
"Opportunity always knocks at the least opportune time."

 

[Itali83]

The codes for rear gears in the glove box are as follows. GU2 = 2.73 GU4 = 3.08 GU6 = 3.42 GT4 = 3.73 GT5 or GT8 = 4.10 and G80 = gov. lock I just did this because I wanted to know what my rear gears were.
Ben 87 Jimmy
"if it ain't got rust, it ain't got character."

 

[Chewy]

You could also check out the specifications page for info.

'87 Beast
Colorado, USA